San Diego County, San Diego Rat Control Situation:
Hi David, Is a UV blacklight still useful, exterior-wise, if it rains after the rodents leave their urine stains? I am in the process of performing exterior maintenance to better exclude my roof rats. 1) I have a 25 year old cedar shake roof in San Diego California with openings under each shake along the rake edge of the roof at the gable ends of my house. There's no drip edge, i.e. under the shakes I have roofing paper (now somewhat curled) that runs more or less up to and rests right atop the fascia board. Because I have skip sheathing, and since the cross section of a shake is a wedge that is up to one inch at the upper, thick end, this appears to create many huge entry points along the rake edges even though the sheathing is rabbeted into the fascia board. As a result, I'm thinking of getting a UV blacklight to use outside the house to sleuth for urine stains along the upper edge of the gable end shakes and fascia boards. My question is, how easily does the winter rain wash away the urine, rendering this a pointless exercise? 2) I noticed a new product called "rat-out gel" and was thinking of applying it along the rake edges mentioned above. Or, maybe I should just buy many rolls of X-Clude and use that instead. Or maybe both. Any comment? Thanks very much for your website, Doug
My response: First off, I do not have experience using UV lights to detect rat urine. But I do suspect that rain will severely limit the effectiveness of this approach. I have never heard of Rat-Out Gel or XClude, but I typically stick to physical barriers rather than repellent type devices. If your roof makes this impossible, you might have a tough time keeping the rats out.
San Diego Rat Control Tip of The Week
How Do Rats Fit In Small Holes, Do They Have Bones?
Rats Can Truly Fit In Small Holes:
A rat needs a space of just about a half an inch to get into an area. Rats have been known to climb through pipes, through areas in the ceiling, and more. Rats can do quite a lot with very little space and this will lead to the chance that they could end up in your home.
Rats Have Joints And Cartilage Like We Do:
The joints and cartilage that rats have can be very similar to the systems that we have. Rats can often work at strengthening their cartilage and joints when they scurry through small spaces. They strengthen their abilities by dashing through small spaces and this ensures that as long as they stay healthy, they can make it through small spaces.
As They Gain Weight They Face Challenges:
As a rat gains weight from staying close to its food source this can lead to the chance that it can no longer fit through holes roughly the size of a quarter. This can make the process of getting into these areas much more challenging. As a rat improves the size of its abdomen, it often loses its ability to fit through tight spaces.
Rats Sense If They Can Fit With Their Whiskers:
Rats are able to fit through areas because their bodies are extremely flexible and cylindrical. The shape of a rat is designed for burrowing and fitting into tight spaces. Rats are able to determine if their body can fit into an area by using their whiskers. This makes every judgment on going through a tight space much easier.
Rats Don't Have Softer Bones:
The skeleton of a rat is just the same as many other rodents. They have hard bones that don't bend and this will often limit the size of the spaces that they can crawl through.
